I agree with very little of that. If you properly care for your iguana it won't bite or tail whip you, actually the opposite- they can be rather sweet. My iguana love to be with us (he can be timid around strangers though). If you neglect your iguana than there's a good chance it will do those things. Yes a bite can and probably will send you to the hospital for stitches.
Iguanas are wild animals. Very, VERY rarely will you just happen to come across a completely tame, sweet iguana that somebody hasn't been working with. They don't tame themselves, if you come across a sweet, friendly iguana, then it came from somebody who spent alot of time with it. It doesn't matter how well you provide for an iguana, you can't expect them to just be sweet because of it. They aren't like children who you can pull a guilt trip with and say "oh I've provided food for you, a roof over your head and the clothes on your back, you need to listen and behave". Once your iguana is tame, then they are deffinitly sweet for the most part. I bet you spent alot of time playing with and interacting with yours. But again, they can still get hormonal during breeding season and they have bad days just like you and I so even with a tame one, there is still the possibility of being bit or whipped.

And about my post being harsh, I wouldn't call it harsh, just blunt. Honestly people NEED to do research before getting one and most people dont. I will give them every single troublesome and bad aspect of owning an iguana if that will get them to think twice about wanting one so the poor ig doesn't get stuck in a neglectful home. If you can read something saying that iguanas can be the meanest lizards possible to own before they get tame, they're hard to tame and they're just as demanding as a dog and not be put off by it and are still dedicated to owning one, then that deffinitly makes the experienced iggy people feel better about somebody getting one as their first lizard.

And about iguanas a dogs, I can have mine together no problem. The dog just needs to respect the ig's space, so you do need to have a well behaved dog. But a dog with a high prey drive might have more of an issue.